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Does lemon juice have higher ph than water? The 10th term of an arithmetic series is 34 and the sum of the first 20 terms is 210. Determine the 25th term.? Ap chemistry help! I am stuck? I need help w/ a complicated Pythagorean Theorem prob.This box won't allow me to put the whole question but I can comment it. Help please!? Write a balanced half reaction for the reduction of MnO2 (s) in acid solution.?